Anti-UVLED light attenuation irradiation crosslinked polyethylene insulating material and preparation method thereof

Abstract

The invention discloses an anti-UVLED light attenuation irradiation crosslinked polyethylene insulating material. Raw materials comprise: matrix resin, a photoinitiator, a photo-initiation auxiliary agent and a polyfunctional crosslinking aid. The matrix resin is composed of polyethylene resin, light-transmitting resin and an ethylene-vinyl acetate copolymer; the photoinitiator is one or more of mixed triaryl sulfonium hexafluorophosphate, [eta]6-isopropylferrocene hexafluorophosphate and ethyl 2,4,6-trimethylbenzoylphenylphosphonate; wherein the photo-initiation auxiliary agent is selected from diethylene glycol divinyl ether, bis((3, 4-epoxycyclohexyl)methyl)adipate, 1,2-epoxy-4-vinylcyclohexane, vinyl glycol ether and vinyl isobutyl ether; the polyfunctional crosslinking aid is selectedfrom one or more of triethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, diallyl phthalate, pentaerythritol triacrylate, tri(2-hydroxyethyl) isocyanate triacrylate and ethoxylated polyfunctional acrylate; The insulating material can be processed at a low temperature, and enough crosslinking degree can be obtained on the premise of not reducing the extrusion speed.

Description

technical field [0001] The invention belongs to the field of ultraviolet light cross-linked polyethylene insulating materials, and in particular relates to an anti-UV LED light decay radiation cross-linked polyethylene insulating material and a preparation method thereof. Background technique [0002] With the continuous progress of science, a new UVLED ultraviolet light source based on LED point light source has emerged. This light source is more energy-saving, environmentally friendly, mercury-free, can work under low temperature conditions, and has a longer service life. Specifically, compared with traditional high-pressure mercury lamps, UVLED has many characteristics: 1. Longer service life, about 35,000 hours; 2. Low energy consumption. Compared with traditional high-pressure mercury lamps, it can save energy by 90%; 3. Cold light source, no infrared heat radiation; 4. No mercury, safe and environmentally friendly; 5. Stable light output; 6. Low maintenance cost, more ...

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Problems solved by technology

[0003] At present, during the production and processing of polyethylene insulating materials for cables, the temperature of the extruder is as high as 170-190°C, and the temperature of the head is higher, as high as 195-210°C. Only in this temperature environment can the polyethylene material be melted completely and more transparent. At the same time, it is more conducive to the penetrating irradiation of ultraviolet rays, but the temperature of the cable prepared in this way is too high, resulting in a high ambient temperature in the ultraviolet irradiation equipment in the same room, high temperature coupled with long-term work, It caused serious light decay of the UVLED lamp bead light source, and the intensity of ultraviolet light decreased; according to the actual situation of the current cable factory: when the UVLED light source on the market is working for 18000-20000h during the normal cable extrusion process, it will cause the UVLED light source to break down. 15%-30% light decay, the result of this is that at the same extrusion speed, the degree of crosslinking of the cable insulation layer is not enough, showing that the thermal extension of the material is unqualified (that is, if the deformation is large under the action of heat and load, it will lose Mechanical properties, until it causes a short circuit, the cable cannot be used normally), and currently the following two methods are usually used to solve the above problems, one of which is to increase the light time by reducing the extrusion speed, but it will inevitably cause production efficiency. The cost of artificial water and electricity has increased significantly, so the overall cost has not decreased; another way is to replace the whole set of UVLED light source. The price of 45-60% of the equipment is about 110,000, that is to say, the light source needs to be replaced after more than 2 years of actual production and use of the whole set of equipment, which also greatly increases the cost of the cable factory

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